Multi-branched Block Copolymer Wetting Agents for Soil Moisture Retention
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Solution Overview
Problem
Existing wetting agents for turf environments are ineffective in preventing dry spot formation and maintaining soil moisture under drought conditions, particularly when used over long application time frames, leading to reduced turf quality and increased water usage.
Innovation Solution
The development of multi-branched block copolymers with a hydrophobic component weight percentage of 40% to 60% and a molecular weight per branch greater than 1700 gmol−1arm−1, which are applied to the soil to improve drought tolerance and prevent dry spot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If traditional linear block copolymers or conventional branched wetting agents are used, then initial wetting performance is achieved, but soil moisture content drops over time and localized dry spot formation occurs under drought conditions
Solution Approach 1:
The patent changes the molecular parameters of the wetting agent by specifying a molecular weight per branch greater than 1700 g/mol and a hydrophobic component content of 40-60% by weight. These parameter changes result in superior soil moisture retention and drought tolerance compared to conventional wetting agents, directly resolving the contradiction between duration of action and reliability under drought conditions
Solution Approach 2:
The invention uses a composite molecular structure consisting of multiple branches with specific hydrophobic and hydrophilic components. This composite structure at the molecular level provides both initial wetting capability and long-term moisture retention, preventing dry spot formation while maintaining reliability under drought stress
2Productivity
If high hydrophobicity wetting agents (70%+ PO content) are used, then initial wetting efficiency is improved, but turf quality deteriorates over long application time frames
Solution Approach 1:
The patent optimizes the hydrophobic component content to a specific range of 40-60% by weight, which is lower than conventional high-hydrophobicity agents (70%+). This parameter change maintains adequate initial wetting efficiency while significantly improving long-term turf quality maintenance, resolving the contradiction between productivity and duration of action
3Ease of operation
If low molecular weight wetting agents are used, then application and distribution are easier, but drought tolerance and soil moisture maintenance are insufficient
Solution Approach 1:
The patent specifies a molecular weight per branch greater than 1700 g/mol, which is higher than conventional low molecular weight agents. This parameter change provides sufficient drought tolerance and soil moisture maintenance while the branched structure ensures adequate application and distribution properties, resolving the contradiction between ease of operation and reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These multi-branched block copolymers effectively enhance turf visual quality and maintain higher soil moisture content, outperforming traditional wetting agents by reducing dry spot formation and improving plant health under drought conditions.
Implementation Method 1
Wetting agents are used in managed turf environments to prevent dry spot formation and reduce water usage. These wetting agents, also known as soil surfactants...
Implementation Method 2
each branch is terminated with either hydrogen or a hydrophobic end group... the percent hydrophobic component, as defined as the weight % PO in the molecule...
Data Source
AI summary
This invention relates to multi-branched block copolymers suitable for use as wetting agents. The multi-branched block copolymers are comprised of an oxygen-containing polyfunctional base compound having at least 3 EO/PO block copolymer branches attached thereto. The improvement lies in: (a) the percent hydrophobic component, as defined as the weight % PO in the molecule, being present in an amount from 40% to 60% by weight and in (b) the molecular weight per branch (or arm), as defined as the total number average molecular weight of the polymer divided by the functionality of the base being greater than 1700 gmol−1arm−1. It was surprisingly discovered that this combination of intermediate hydrophobicity and high molecular weight give superior drought tolerance for plants treated therewith.